CN102725056B - Mixing system for an exhaust gases after-treatment arrangement - Google Patents
Mixing system for an exhaust gases after-treatment arrangement Download PDFInfo
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- CN102725056B CN102725056B CN200980163019.5A CN200980163019A CN102725056B CN 102725056 B CN102725056 B CN 102725056B CN 200980163019 A CN200980163019 A CN 200980163019A CN 102725056 B CN102725056 B CN 102725056B
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- mixing arrangement
- blade
- pipeline
- hybrid system
- sleeve
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- 238000002156 mixing Methods 0.000 title claims abstract description 116
- 239000007789 gas Substances 0.000 title abstract description 6
- 230000002093 peripheral effect Effects 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 14
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 17
- 239000004202 carbamide Substances 0.000 claims description 17
- 239000007864 aqueous solution Substances 0.000 claims description 8
- 238000007598 dipping method Methods 0.000 claims description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 239000007921 spray Substances 0.000 description 8
- 238000005507 spraying Methods 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000004176 ammonification Methods 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- -1 NOx compound Chemical class 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
- B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
- B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
- B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Dispersion Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The mixing system comprises: - a pipe (1) having a longitudinal axis (2), in which exhaust gases can flow in a flow direction (FD); - a nozzle designed to inject a fluid inside the pipe (1 ) from an injection inlet (5) arranged in the pipe wall, according to an injection direction (ID); - a first mixing device (6) positioned inside the pipe (1) upstream from the injection inlet (5), said first mixing device including a peripheral portion comprising blades (14, 15) capable of creating a peripheral swirl along the pipe wall, and a central portion designed to create substantially no turbulence; - a second mixing device (7) positioned inside the pipe (1) downstream from the injection inlet (5), said second mixing device (7) including a central portion (26) comprising blades (27, 28) capable of creating a swirl inside the pipe (1).
Description
Technical field
The present invention relates to a kind of hybrid system for exhaust aftertreatment equipment, for example the exhaust aftertreatment equipment in discharge duct.Described system is especially designed to improve mixing between the exhaust of fluid and Thermal Motor (thermal engine), also prevents from forming on the wall of described pipeline the solid deposits of described fluid simultaneously.The inventive example if be used in the discharge duct of Diesel engine, wherein, for the post processing of exhaust, has been sprayed the aqueous solution of urea.
Background technology
The exhaust forming in the combustion process of the fuel in internal combustion engine may contain a certain proportion of unexpected material, such as nitrogen oxide (NOx), carbon monoxide (CO), unburned hydrocarbon (HC), soot etc.
In order to alleviate air pollution, therefore vehicle is equipped with the various after-treatment systems of the unexpected material in reply exhaust.
Common exhaust after treatment system is so-called SCR (SCR) system.Wherein added ammonia and usingd and process in special catalyst as the exhaust of reducing agent, in this catalyst, nitrogen oxide is converted into water and nitrogen, and the two is all nontoxic material.Ammonia is introduced by the form with urea in the aqueous solution, by hydrolysis, from this aqueous solution, obtains ammonia.Conventionally, urea is atomized in the exhaust of catalyst upstream.For this reason, on the exhaust lay out of this catalyst upstream, be equipped with urea-spray nozzle.
The problem of such pump-down process is: before urea changes ammonification, crystallization may occur urea.With concrete term, say, the aqueous solution that is ejected into the urea in discharge duct by nozzle trends towards for example on the wall at discharge duct of the inner side contrary with spray site, forming solid deposits at it according to the direction angled with flow direction of exhaust gases.As a result, the cross section of discharge duct reduces gradually, and this reduces engine efficiency, and the long-term operation of possibility grievous injury engine.
The device of a lot of prior aries is not fully effective, because they can not realize liquid area, to complete chemical breakdown and/or the urea of gas, mixes with the gratifying of exhaust.
A kind of conventional equipment that is commonly called " eddy current case (swirl box) " can be realized above-mentioned two results to a certain extent.Yet this eddy current case has several defects: first, it needs long enough, with allow urea, chemical breakdown completely roughly, therefore, it may be very huge.And in the time must this eddy current case being installed, it requires parts around to design adjusting conventionally.In addition, this eddy current case can cause back pressure and very expensive.In any case known this eddy current case design can not always prevent solid deposits effectively.
Therefore,, for to being loaded with the system of spraying fluid in the pipeline of exhaust and making its mixing, seem to exist certain room for improvement.
Summary of the invention
An object of the present invention is to provide a kind of improved hybrid system, this hybrid system can overcome the defect running in conventional hybrid system, especially can prevent or at least the fluid that sprays of restriction on pipe surface, form deposit, also promoted between the fluid that sprays and exhaust, gratifying mixing simultaneously.
For this reason, the present invention has considered a kind of hybrid system for exhaust aftertreatment equipment, and described hybrid system comprises:
Pipeline, this pipeline has longitudinal axis, and exhaust can be flowed by streamwise (FD) in this pipeline;
Nozzle, this nozzle is designed to fluid along injection direction (ID), from the injection entrance being arranged in the wall of described pipeline, is ejected in described pipeline;
The first mixing arrangement, this first mixing arrangement in the located upstream of described injection entrance in described pipeline;
Wherein, this first mixing arrangement comprises: outer peripheral portion, and this outer peripheral portion comprises can produce along the wall of described pipeline the blade of circumferential eddy currents; And middle body, this middle body is designed to substantially not produce any turbulent flow, or only produce the turbulent flow producing with described outer peripheral portion and compare the turbulent flow that can ignore, and wherein, this hybrid system also comprises the second mixing arrangement, this second mixing arrangement is in the downstream location of described injection entrance in described pipeline, and described the second mixing arrangement comprises middle body, and the middle body of described the second mixing arrangement comprises can produce the blade of eddy current in described pipeline.
By producing circumferential eddy currents, the first mixing arrangement that is positioned at described injection entrance upstream has prevented that this fluid from drenching the wall of described pipeline, or at least greatly reduced this effect of drenching, the above-mentioned wall of described pipeline especially but and nonessential relative with described injection entrance.As a result, avoid or limitation in height solid deposits.
Described the first mixing arrangement is designed to the main turbulent flow that produces in the peripheral part in pipe interior space.For example, just in the downstream of this first mixing arrangement, in the peripheral part in pipe interior space, in described pipeline, the turbulent kinetic energy of mobile fluid is at least ten times of turbulent kinetic energy in the middle body in this pipe interior space.Another advantage that the middle body of this first mixing arrangement does not produce any turbulent flow is substantially that it has limited back pressure.In fact, the generation of circumferential eddy currents is enough to realize the target of described the first mixing arrangement, that is: avoid forming deposit on the madial wall of pipeline.
In addition the second mixing arrangement that, is positioned at described injection entrance downstream has dual-use function.In fact, it has produced central vortex flow in described pipeline, and this eddy current forms complementation with the eddy current being produced by the first mixing arrangement, contributes in addition to destroy fluid drop.As a result, the second mixing arrangement has promoted the mixing between fluid (or the decomposition by described fluid obtain gas) and exhaust, and, in the situation that this fluid is the aqueous solution of urea, promoted the decomposition of liquid area to gas.
Utilize this arrangement, hybrid system according to the present invention is more much effective than the system of prior art aspect evaporation, decomposition and mixing, and can greatly reduce the solid deposits on the inner surface of pipeline.
Advantageously, the middle body of described the first mixing arrangement is not substantially containing blade.Preferably, except substantially not producing reinforcement members any turbulent flow, possible, described middle body no longer contains other any elements.
In one embodiment of the invention, the outer peripheral portion of described the first mixing arrangement forms a ring, and this ring has the certain width of radially measuring, this width the radius of the first mixing arrangement about 30% to about 50% between.
According to one embodiment of present invention, described the first mixing arrangement comprises:
The sleeve of substantial cylindrical, this sleeve has axis, and has roughly formed the outer peripheral portion of described the first mixing arrangement and the border between middle body;
A plurality of spoke members, described a plurality of spoke members extends beyond described sleeve from the region around the axis of described sleeve, the end of these spoke members contacts with the wall of described pipeline, thereby in the time of in the first mixing arrangement is positioned at described pipeline, the axis of described sleeve is roughly consistent with the axis of described pipeline.
Preferably, the outer peripheral portion of described the first mixing arrangement can comprise the outer shroud consisting of roughly the same outside blade and the interior ring consisting of roughly the same inner side blade, described outside blade can produce circumferential eddy currents, and described inner side blade can make exhaust outwards towards the described outer shroud deflection consisting of outside blade.Therefore the generation that, these inner side blades have centrifugal effect and contribute to circumferential eddy currents.Provide two groups of blades also to make it possible to produce larger turbulent flow, this has strengthened the mixing between fluid and exhaust.The shape of described inner side blade is preferably different from the shape of outside blade.
For example, each outside blade all extends towards downstream direction from the downstream radial edges of described spoke members, and described outside blade also tilts towards contiguous spoke members, and all outside blades all tilt in the same way.
Each inner side blade all can extend towards downstream direction from the downstream edge of described sleeve, and described inner side blade is also outward-dipping.Therefore, described inner side blade forms the truncated cone of dispersing towards downstream direction together.Preferably, each the inner side blade all free end from described sleeve towards this inner side blade further narrows down obliquely gradually, and therefore, these inner side blades are arranged to produce eddy current along the direction of rotation identical with outside blade.
About described the second mixing arrangement, it comprises the outer peripheral portion that does not preferably substantially contain blade.Therefore, limited the pressure loss.Yet in described outer peripheral portion, the second mixing arrangement can be provided with and be designed to allow described the second device to be positioned at the member in described pipeline.
According to the preferred embodiment of the present invention, the blade of the middle body of the blade of the outer peripheral portion of described the first mixing arrangement and described the second mixing arrangement is by reciprocally directed.By producing two contrary eddy current, this arrangement has improved the mixing of fluid in described pipeline and exhaust and has improved the homogenieity of described mixture.
Described the second mixing arrangement can comprise:
The sleeve of substantial cylindrical, this sleeve has axis, and has roughly formed the outer peripheral portion of described the second mixing arrangement and the border between middle body;
A plurality of spoke members, described a plurality of spoke members extends beyond described sleeve from the region around the axis of described sleeve, the end of these spoke members contacts with the wall of described pipeline, thereby when described the second mixing arrangement is positioned at described pipeline, the axis of described sleeve is roughly consistent with the axis of described pipeline.
The middle body of described the second mixing arrangement preferably includes the outer shroud consisting of roughly the same outside blade and the interior ring consisting of roughly the same inner side blade.By two groups of different blades are provided, the turbulent flow obtaining is larger.
For example, each inner side blade all extends towards downstream direction from the downstream radial edges of described spoke members, and described inner side blade also tilts towards contiguous spoke members, and all inner side blades all tilt in the same way.
Each outside blade all can extend towards downstream direction from the downstream edge of described sleeve, and described outside blade is also outward-dipping.Preferably, each the outside blade all free end from described sleeve towards this outside blade further narrows down obliquely gradually, and therefore, these outside blades are arranged to produce eddy current along the direction of rotation identical with inner side blade.
The middle body that can also imagine this first blender and the second blender roughly has identical radius.Therefore, when seeing along the axis of described pipeline, the first mixing arrangement of arranged in succession and the second mixing arrangement seemingly superpose, and look like it is at its vaned single structure of tool all on whole cross section almost.
Concrete application of the present invention is that the NOx in exhaust is processed.In the case, described pipeline is the discharge duct of Diesel engine, and described fluid is the aqueous solution of urea.
The present invention can obtain mixing between exhaust and urea, gratifying, then, when urea decomposes, can further in downstream, obtain between NOx and ammonia, gratifying mixing.Therefore, can effectively reduce NOx compound and realize significantly lower NOx discharge.Meanwhile, the present invention has effectively prevented that the urea that not yet decomposes ammonification from forming deposit on especially relative with urea-spray pipeline pipeline, thereby has extended the service life of described discharge duct.
When reading following description with reference to appended herein accompanying drawing, above-mentioned these and other feature and advantage will become apparent, and these accompanying drawings show the embodiment of vehicle according to the invention as limiting examples.
Accompanying drawing explanation
When reading in conjunction with the accompanying drawings, can understand better the following detailed description to the several embodiment of the present invention, yet, should be appreciated that and the invention is not restricted to disclosed these specific embodiments.
Fig. 1 is the perspective view of discharge duct, and this discharge duct comprises for spraying the nozzle of fluid, and in this discharge duct, is provided with upstream the first mixing arrangement and downstream the second mixing arrangement;
Fig. 2 and Fig. 3 are respectively axial view and the perspective views of the first mixing arrangement;
Fig. 4 and Fig. 5 are respectively axial view and the perspective views of the second mixing arrangement;
Fig. 6 and Fig. 7 are respectively when upstream seeing and while seeing downstream, the axial view of above-mentioned pipeline and mixing arrangement;
Fig. 8 near the first mixing arrangement and the second mixing arrangement, exhaust is in the diagram of above-mentioned ducted flow circuits.
The specific embodiment
Fig. 1 shows pipeline 1, and this pipeline 1 is that engine, typical case are the discharge ducts of Diesel engine.Only show a straight part of pipeline 1, yet pipeline 1 can also comprise several bends in the upstream and/or the downstream that are positioned at described straight part.Pipeline 1 has central axis 2 extending longitudinally in this straight part.Pipeline 1 has radius R 1.
Engine exhaust can start the entrance 3 of pusher side to flow towards the outlet 4 of pipeline 1 from being positioned at of pipeline 1 in pipeline 1, at this, exports 4 places, and described exhaust was first guided towards unshowned catalyst before discharging into the atmosphere.The overall flow direction FD of this exhaust is roughly parallel to the central axis 2(of pipeline from being designed to produce the upstream of turbulent any mixing arrangement).Above-mentioned term " upstream " and " downstream " are used for described flow direction FD.Contrary with above-mentioned term " outside ", " inside " refers to the part of the axis 2 of its more close pipeline in position.
In the wall of described pipeline, be provided with and spray entrance 5.Be arranged in nozzle (not shown) in described injection entrance 5 and be designed to fluid along injection direction ID, by spraying entrance 5, be ejected in pipeline 1, form thus jet.Described injection direction ID roughly points to downstream, also has a certain degree with described flow direction FD simultaneously.For example, this corresponding angle can be about 30 °-75 °.In an illustrated embodiment, above-mentioned fluid is the aqueous solution of urea.Regardless of the direction of the further flow further downstream of described fluid, when especially described fluid is deflated suction, injection direction ID sprays the direction of fluid at nozzle exit.
As shown in Figure 1, the first mixing arrangement 6 is spraying the upstream of entrance 5, near these injection entrance 5 ground, is being fastened in pipeline 1.The second mixing arrangement 7 is fastened in pipeline 1 in the downstream of spraying entrance 5.The first mixing arrangement 6 and the distance of spraying between entrance 5 are less than the second mixing arrangement 7 and spray the distance between entrance 5.These two mixing arrangements 6,7 all can be made by stainless steel.
The first mixing arrangement 6 has been shown in Fig. 2 and Fig. 3.It comprises: the sleeve 8 of substantial cylindrical, and this sleeve 8 has axis 9, radius R 2; And a plurality of spoke members 10, described a plurality of spoke members 10 roughly radially extend beyond described sleeve 8 from the region around the axis 9 of sleeve.In an illustrated embodiment, the first mixing arrangement 6 comprises eight spoke members 10.These spoke members are regular spaced apart angularly around the axis 9 of sleeve.Spoke members 10 be general planar and be parallel to flow direction FD.When the first mixing arrangement 6 is positioned at pipeline 1 when interior, the outboard end 11 of spoke members 10 contacts with the inner surface of the wall of described pipeline and guarantees that the axis 9 of sleeve is roughly consistent with the axis 2 of pipeline.
Sleeve 8 has roughly formed the outer peripheral portion 12 of described the first mixing arrangement 6 and the border between middle body 13.This outer peripheral portion 12 forms a ring, the width of this ring the radius (being the radius R 1 of described pipeline) of the first mixing arrangement about 30% to about 50% between.
Except the central portion of spoke members 10, middle body 13 substantially no longer comprises other any elements.Especially, middle body 13 is not containing any blade.Therefore, middle body 13 does not produce any turbulent flow substantially, or only produces the turbulent flow producing with outer peripheral portion 12 and compare the turbulent flow that can ignore.
Outer peripheral portion 12 comprises the outer shroud consisting of roughly the same outside blade 14 and the interior ring consisting of roughly the same inner side blade 15.In an illustrated embodiment, outside blade 14 is longer than inner side blade 15.Different from spoke 10 and sleeve 8, blade 14,15 and described overall flow direction FD have a certain degree.
Each outside blade 14 is the downstream radial edges 16 from a spoke members 10(from spoke members 10 all) towards downstream direction, extend.In addition, each outside blade 14 all towards contiguous spoke members 10, with respect to the extension plane inclination of spoke members 10.All outside blades 14 all tilt in the same way, and therefore, as shown in Figure 8, these outside blades 14 can produce circumferential eddy currents along the wall of described pipeline.When seeing downstream, this circumferential eddy currents rotates clockwise.Yet, also can adopt contrary structure.Preferably, each outside blade 14 is all from spoke members 10, narrow down gradually towards the free end 17 of outside blade 14.
In addition, each inner side blade 15 all extends from sleeve 8 between two adjacent outside blades 14.Each inner side blade 15 all extends towards downstream direction from the downstream edge 18 of sleeve 8.Inner side blade 15 is outward-dipping, thereby these inner side blades 15 can make exhaust outwards towards the described outer shroud deflection consisting of outside blade 14.In addition, the free end 19 of inner side blade 15 from sleeve 8 towards inner side blade 15 narrows down gradually and has sloping edge 20, and thus, inner side blade 15 is designed to produce eddy current along the direction of rotation identical with outside blade 14.
The second mixing arrangement 7 has been shown in Fig. 4 and Fig. 5.It comprises the sleeve 21 of substantial cylindrical, and this sleeve 21 has axis 22 and radius R 3, and this radius R 3 equals the radius R 2 of the sleeve 8 of the first mixing arrangement 6 substantially.The second mixing arrangement 7 also comprises a plurality of spoke members 23, and these spoke members 23 extend beyond described sleeve 21 from the region around the axis 22 of sleeve.In an illustrated embodiment, the second mixing arrangement 7 comprises eight spoke members 23.Spoke members 23 be general planar and be parallel to flow direction FD.When the second mixing arrangement 7 is positioned at pipeline 1 when interior, the end 24 of spoke members 23 contacts with the inner surface of described duct wall and guarantees that the axis 22 of sleeve is roughly consistent with the axis 2 of pipeline.
Sleeve 23 has roughly formed the outer peripheral portion 25 of described the second mixing arrangement 7 and the border between middle body 26.Outer peripheral portion 25 forms a ring, the width of this ring the radius (being the radius R 1 of described pipeline) of the first mixing arrangement about 30% to about 50% between.
Except the end member of spoke members 23, outer peripheral portion 25 substantially no longer comprises other any elements.Especially, outer peripheral portion 25 is not containing any blade.
Middle body 26 comprises the outer shroud consisting of roughly the same outside blade 27 and the interior ring consisting of roughly the same inner side blade 28.In an illustrated embodiment, inner side blade 28 is longer than outside blade 27.
Each inner side blade 28 is the downstream radial edges 29 from a spoke members 23(from spoke members 23 all) towards downstream direction, extend.In addition, each inner side blade 28 all towards contiguous spoke members 23, with respect to the extension plane inclination of spoke members 23.All inner side blades 28 all tilt in the same way, and therefore, as shown in Figure 8, these inner side blades 28 can be in pipeline 1, around also producing eddy current near axis 2.The orientation of described blade 28 is contrary with the orientation of the blade 14,15 of the first mixing arrangement 6, to produce reverse rotation stream.Therefore, in an illustrated embodiment, when seeing downstream, described central vortex flow is along being rotated counterclockwise.Preferably, each inner side blade 28 all the free end from spoke members 23 towards inner side blade 28 30 narrow down gradually.
In addition, each outside blade 27 all extends from sleeve 21 between two adjacent inner side blades 28.Each outside blade 27 all extends towards downstream direction from the downstream edge 31 of sleeve 21.Outside blade 27 is outward-dipping.In addition, the free end 32 of outside blade 27 from sleeve 21 towards outside blade 27 narrows down gradually and has sloping edge 33, and thus, outside blade 27 is designed to produce eddy current along the direction of rotation identical with inner side blade 28.The orientation of described blade 27 is contrary with the orientation of the blade 14,15 of the first mixing arrangement 6, to produce reverse rotation stream.
Fig. 6 and Fig. 7 are respectively when upstream seeing and while seeing downstream, the axial view of described pipeline 1 and mixing arrangement 6,7.
As mentioned above, the invention provides:
The first mixing arrangement 6, this first mixing arrangement 6 has the blade 14,15 of inclination in its outer peripheral portion 12, but in the central in part 13 substantially containing blade, thereby, in the central portion that does not substantially affect exhaust stream, promoted along the eddy current of the wall of discharge duct 1; And
The second mixing arrangement 7, this second mixing arrangement 7 mainly has blade 27,28 to promote mixing in part 26 in the central, the blade 14,15 of the first mixing arrangement 6 and the blade 27,28 of the second mixing arrangement 7 are by reciprocally directed, to produce reverse rotation stream.
From Fig. 6 and Fig. 7, mixing arrangement 6,7 " stack " along the longitudinal direction looks like these two devices to be at its vaned single mixing arrangement of tool all on whole surf zone almost.This can also be by making radius R 2 and R3 substantially equate to realize.This combination results of the first mixing arrangement 6 and the second mixing arrangement 7 turbulent flow, it has improved evaporation and the decomposition of urea (fluid spraying), and urea, ammonia mix with exhaust.
Fig. 8 shows exhaust at described ducted flow circuits.
From the upstream of the first mixing arrangement 6, exhaust flows into from the entrance 3 of described pipeline, and its flow circuits is roughly parallel to the axis 2 of pipeline.
The first mixing arrangement 6 makes: be arranged in the exhaust rotation (turning clockwise) of the outer peripheral portion in pipe interior space here, but the exhaust that is arranged in the middle body in pipe interior space do not deflect substantially, but continue to flow along the axis 2 of pipeline.As a result, utilize circumferential eddy currents 40, prevented that the fluid spraying along injection direction ID from the downstream of the first mixing arrangement 6 from drenching the inner surface of described duct wall.
Then, the second mixing arrangement 7 produces the central vortex flow 41 that preferably includes most of fluid jet, and when improving the mixing of described fluid and exhaust, described in further drawn downstream fluid.
For optimization efficiency, can flow and adjust described mixing arrangement 6,7 with line characteristic according to this.Can determine some parameter according to relevant situation, for example the diameter of sleeve; The number of blade ring; The number of blade, width, length and angle.
In addition, described mixing arrangement can be easily located in existing pipeline, or can be also a part for new discharge duct.Although should be noted that this hybrid system is preferably in straight duct section uses, it also can use in slight curving pipeline (that is, though its longitudinal axis is not straight line can be the pipeline of two dimension or three-dimensional curve (curb)).Preferably, in the installation region of this hybrid system, the axis of pipeline is only by moderately crooked.
For example, consider the regeneration of diesel particulate filter of the arranged downstream of this hybrid system, also can adopt above-mentioned hybrid system in the situation that sprayed fluid is fuel.
Certainly, the embodiment that the invention is not restricted to above describe by limiting examples, but it should contain all embodiment of the present invention.
Claims (15)
1. for a hybrid system for exhaust aftertreatment equipment, described hybrid system comprises:
Pipeline (1), described pipeline (1) has longitudinal axis (2), and exhaust can be flowed by streamwise (FD) in described pipeline (1);
Nozzle, described nozzle is designed to fluid along injection direction (ID), from the injection entrance (5) being arranged in the wall of described pipeline, is ejected in described pipeline (1);
The first mixing arrangement (6), described the first mixing arrangement (6) in the located upstream of described injection entrance (5) in described pipeline (1);
It is characterized in that, described the first mixing arrangement (6) comprising: outer peripheral portion (12), and described outer peripheral portion (12) comprises can produce along the wall of described pipeline the blade (14,15) of circumferential eddy currents (40), and middle body (13), described middle body (13) is designed to substantially not produce any turbulent flow, or only produce the turbulent flow producing with described outer peripheral portion (12) and compare the turbulent flow that can ignore, and, described hybrid system also comprises the second mixing arrangement (7), described the second mixing arrangement (7) in the downstream location of described injection entrance (5) in described pipeline (1), described the second mixing arrangement (7) comprises middle body (26), the middle body (26) of described the second mixing arrangement (7) comprises can produce the blade (27 of eddy current (41) in described pipeline (1), 28).
2. hybrid system according to claim 1, is characterized in that, the middle body (13) of described the first mixing arrangement (6) is not containing blade.
3. hybrid system according to claim 1 and 2, is characterized in that, the outer peripheral portion (12) of described the first mixing arrangement (6) forms a ring, the width of described ring the radius of described the first mixing arrangement 30% to 50% between.
4. hybrid system according to claim 1, is characterized in that, described the first mixing arrangement (6) comprising:
The sleeve of substantial cylindrical (8), described sleeve (8) has axis (9), and has roughly formed the outer peripheral portion (12) of described the first mixing arrangement (6) and the border between middle body (13);
A plurality of spoke members (10), described a plurality of spoke members (10) extends beyond described sleeve (8) from the axis (9) of described sleeve region around, the end (11) of described spoke members (10) contacts with the wall of described pipeline, thereby in the time of in described the first mixing arrangement (6) is positioned at described pipeline (1), the axis of described sleeve (9) is roughly consistent with the axis (2) of described pipeline.
5. hybrid system according to claim 1, it is characterized in that, the outer peripheral portion (12) of described the first mixing arrangement (6) comprises the outer shroud consisting of roughly the same outside blade (14) and the interior ring consisting of roughly the same inner side blade (15), described outside blade (14) can produce described circumferential eddy currents (40), and described inner side blade (15) can make exhaust outwards towards the described outer shroud deflection consisting of described outside blade.
6. according to the hybrid system described in claim 4 or 5, it is characterized in that, each outside blade (14) all extends towards downstream direction from the downstream radial edges (16) of spoke members (10), described outside blade (14) also tilts towards contiguous spoke members (10), and all outside blades (14) all tilt in the same way.
7. according to the hybrid system described in claim 4 or 5, it is characterized in that, each inner side blade (15) all extends towards downstream direction from the downstream edge (18) of described sleeve (8), and described inner side blade (15) is also outward-dipping.
8. hybrid system according to claim 1, is characterized in that, described the second mixing arrangement (7) comprises the outer peripheral portion (25) that does not contain blade.
9. hybrid system according to claim 1, it is characterized in that, the blade (27,28) of the blade (14,15) of the outer peripheral portion (12) of described the first mixing arrangement (6) and the middle body (26) of described the second mixing arrangement (7) is by reciprocally directed.
10. hybrid system according to claim 1, is characterized in that, described the second mixing arrangement (7) comprising:
The sleeve of substantial cylindrical (21), described sleeve (21) has axis (22), and has roughly formed the outer peripheral portion (25) of described the second mixing arrangement (7) and the border between middle body (26);
A plurality of spoke members (23), described a plurality of spoke members (23) extends beyond described sleeve (21) from the axis (22) of described sleeve region around, the end (24) of described spoke members (23) contacts with the wall of described pipeline, thereby in the time of in described the second mixing arrangement (7) is positioned at described pipeline (1), the axis of described sleeve (22) is roughly consistent with the axis (2) of described pipeline.
11. hybrid systems according to claim 1, is characterized in that, the middle body (26) of described the second mixing arrangement (7) comprises the outer shroud consisting of roughly the same outside blade (27) and the interior ring consisting of roughly the same inner side blade (28).
12. according to the hybrid system described in claim 10 or 11, it is characterized in that, each inner side blade (28) all extends towards downstream direction from the downstream radial edges (29) of spoke members (23), described inner side blade (28) also tilts towards contiguous spoke members (23), and all inner side blades (28) all tilt in the same way.
13. according to the hybrid system described in claim 10 or 11, it is characterized in that, each outside blade (27) all extends towards downstream direction from the downstream edge (31) of described sleeve (21), and described outside blade (27) is also outward-dipping.
14. hybrid systems according to claim 1, is characterized in that, the middle body (13,26) of described the first mixing arrangement and described the second mixing arrangement (6,7) roughly has identical radius (R2, R3).
15. hybrid systems according to claim 1, is characterized in that, described pipeline (1) is the discharge duct of Diesel engine, and fluid is the aqueous solution of urea.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/IB2009/008008 WO2011073717A1 (en) | 2009-12-18 | 2009-12-18 | Mixing system for an exhaust gases after-treatment arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102725056A CN102725056A (en) | 2012-10-10 |
| CN102725056B true CN102725056B (en) | 2014-08-20 |
Family
ID=42647360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200980163019.5A Active CN102725056B (en) | 2009-12-18 | 2009-12-18 | Mixing system for an exhaust gases after-treatment arrangement |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9909421B2 (en) |
| EP (1) | EP2512642B1 (en) |
| CN (1) | CN102725056B (en) |
| WO (1) | WO2011073717A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2512642A1 (en) | 2012-10-24 |
| US9909421B2 (en) | 2018-03-06 |
| WO2011073717A1 (en) | 2011-06-23 |
| CN102725056A (en) | 2012-10-10 |
| EP2512642B1 (en) | 2014-02-26 |
| US20130170973A1 (en) | 2013-07-04 |
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